I'm going corn fed in the next couple months but need to verify what the max whp a set of Walbro 255's will support. I'm not looking to make over 675 on my Whipple'd Mach 1. I think 650 will be plenty. Reason for looking at the 255's over the 465's is because I do not want to swap out my fuel hat again in order to handle the larger Walbro's. If I can use the 255's I'll be ecstatic but I need to know what I can safely push them to.